Especially when there isn’t clear harm being done to another person.
We have lots of laws to protect people from themselves and from the lies of corporations and such. Seatbelt and helmet laws are the most obvious. We can’t, as a society, expect people to be an expert on every subject. So people make laws to enforce certain actions to protect people from ignorance and misinformation. Hopefully these laws get passed after a lot of scientific evidence shows they are necessary and not political bigotry like cannabis bans and such.